Ext.onReady(function() {
			var root = new Ext.tree.TreeNode({
						id : "root",
						text : "树的根"
					});
			var c1 = new Ext.tree.TreeNode({
						text : "子节点1"
					})
			var c2 = new Ext.tree.AsyncTreeNode({
						text : "子节点2"
					});
			root.appendChild(c1);
			root.appendChild(c2);
			var tree = new Ext.tree.TreePanel({
						renderTo : "hello",
						root : root,
						width : 300,
						loader : new Ext.tree.TreeLoader({
									applyLoader : false,
									url : "js/demo/treedata0908.js"
								})
					});
		});